单项选择题
An intermediate spring is（）.
A.fitted in each leg of the towing bridle B.generally located between the "fishplate" and the main towing hawser C.secured at the "H" bitts D.usually made of manila hawser
单项选择题 An instrument that maintains a continuous record of humidity changes is called a（）.
单项选择题 An instrument that indicates wind direction is known as a(n)（）.
单项选择题 All of the following steps are taken in starting a centrifugal pump，EXCEPT to（）.
